Romulan Type 4 was a material option, an Alpha Quadrant Alliance designation for the visual appearance of a spacecraft's outer hull, i.e. a vessel's "skin". Romulan Type 4 was available for some warbird classes of the Romulan Republic and its Romulan Republican Force. Type 4 put the ship in a cover of variously shaded greens. The warp plasma in the nacelles appeared bright green. (STO - From the Ashes mission: "Explore the Flotilla")
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Related ship classes are sorted together, rather than alphabetically.